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Calling a batch file from lua!
Author
Hi,
I need to call a batch file from a lua script !
My c++ prog uses lua scripts and on of them needs to call a batch file that takes two argumets
from dos it would look like::
batch c:\folder1 c:\folder2
but can i call this file from a lua script (lua 4)
I''m pretty sure Lua has the ability to execute console commands on the host machine, like C''s system(), but I can''t remember the function name.
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Author
I have gone through the documentation and i cannot find anything mentioned! Do not want t mail the mailing list yet!
Does anybody know?
Does anybody know?
Try:
execute("batch c:\\folder1 c:\\folder2")
Works in Lua 4.0.1, don't know if it's changed in 5.0.
EDIT: Just saw that you said Lua 4, so it should work.
[edited by - Dactylos on May 17, 2003 6:24:24 AM]
execute("batch c:\\folder1 c:\\folder2")
Works in Lua 4.0.1, don't know if it's changed in 5.0.
EDIT: Just saw that you said Lua 4, so it should work.
[edited by - Dactylos on May 17, 2003 6:24:24 AM]
Author
Thank you very much.... is that documented... will go and take a look now !!
If not will google it
Thanks again :-)
If not will google it
Thanks again :-)
Author
The folder names will be decided at run time by the lua script so they will have to be held in two variables.
E.g. Argument1 & Argumnet2
So for example Argument1 = c:\folder1
Argument2 = c:\folder2
So calling execute[[ batch Argument1 Argumnet2 ]]
would pass the actual string=''Argument1'' to the batch file rather that the path held by the varialbe Argument1
So you execute(batch Argument1 Argument2)
work?
or will it need the square brackets.... thanks lads
Brian
You can use the .. operator which concatenates strings:
Argument1 = "C:\\folder1" -- notice: \\ produces \Argument2 = "C:\\folder2"execute("batch " .. Argument1 .. " " .. Argument2) execute("batch C:\\folder1 C:\\folder2")
Author
Lua doesn''t do string interpolation. Here''s what you do, assuming you are
using Lua 4
function subst(str, table)
local v = gsub(str, ''$([_%a][_%w]*)'',
function(w) return %table[w] or '''' end)
return v
end
args = {
Argument1 = [[c:\folder1]],
Argument2 = [[c:\folder2]],
}
cmd = [[ batch $Argument1 $Argument2 ]]
print(subst(cmd, args))
execute(subst(cmd, args))
The above is a more complicated solution that should work..but your solution looks so much more tidy!
Regards
Brian
using Lua 4
function subst(str, table)
local v = gsub(str, ''$([_%a][_%w]*)'',
function(w) return %table[w] or '''' end)
return v
end
args = {
Argument1 = [[c:\folder1]],
Argument2 = [[c:\folder2]],
}
cmd = [[ batch $Argument1 $Argument2 ]]
print(subst(cmd, args))
execute(subst(cmd, args))
The above is a more complicated solution that should work..but your solution looks so much more tidy!
Regards
Brian
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